Filter key device



FIG. 1 is a top, front, right side perspective view of a filter key device showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top, back, right side perspective view thereof;

FIG. 7 is a top, back, left side perspective view thereof;

FIG. 8 is a top, front, left side perspective view thereof;

FIG. 9 is a bottom, back, left side perspective view thereof;

FIG. 10 is a bottom, back, right side perspective view thereof;

FIG. 11 is a bottom, front, left side perspective view thereof; and,

FIG. 12 is a bottom, front, right side perspective view thereof.

The broken line showing of various features of the filter key device form no part of the claimed design.

The broken line showing of various features of the filter key device form no part of the claimed design. 

CLAIM The ornamental design of a filter key device, as shown and described. 